Riser unit and pouring system with same

Abstract

The invention relates to the field of pouring systems, in particular to a riser unit and a pouring system with the riser unit.The riser unit comprises riser components, each riser component comprises a riser, and each riser is provided with a liquid inlet, a liquid outlet and a riser neck; a liquid inlet of each riser is connected with an upper connecting pouring gate; a liquid outlet of the riser is connected with a lower connecting pouring gate; the adjacent riser parts can be connected with each other, and the lower connecting pouring gate of one riser is connected with the upper connecting pouring gate of the adjacent riser; the lower connecting pouring gate is in lap joint with the adjacent upper connecting pouring gate; according to the riser unit disclosed by the invention, the lower connecting pouring gate and the upper connecting pouring gate are arranged, so that the adjacent risers are conveniently connected in series, and the lower connecting pouring gate and the adjacent upper connecting pouring gate are required to be lapped with each other; through the arrangement, the flow velocity of molten metal between the adjacent risers can be slowed down, the modulus of connection between the upper riser and the lower riser is reduced under the condition that the same flow choking area is ensured, and shell breaking of the lower riser is facilitated.

Description

Technical Field

[0001] This invention relates to the field of gating systems, and more specifically to a riser unit and a gating system having the riser unit. Background Technology

[0002] Casting is an important process for obtaining metal parts blanks. The quality of the gating system design directly affects the internal quality of the castings, the yield rate, and the production cost.

[0003] An ideal gating system should be able to smoothly and cleanly introduce molten metal into the mold cavity and effectively compensate for the solidification process of the casting, thereby minimizing casting defects such as sand holes, porosity, shrinkage cavities, and shrinkage porosity.

[0004] Traditional gating systems typically consist of a pouring cup, sprue, runner, ingate, and riser. In practical applications, especially when producing large, complex box-shaped castings, traditional designs often face the following significant challenges: Metal molten metal impact and air entrapment issues: The molten metal pouring out of the ladle has high kinetic energy. If it directly impacts the sprue or mold cavity, it can easily cause sand erosion, secondary sand inclusions, and air entrapment, forming defects such as sand holes and pores.

[0005] Although structures such as horizontal runners and slag collection bags are often set up to block slag, a single flaring or settling chamber is often insufficient to efficiently remove all impurities in a complex multi-way distribution system. In particular, small inclusions are easy to enter the cavity with the liquid flow.

[0006] The existing gating system typically uses a direct connection between the upper and lower risers to achieve rapid casting. However, due to the low friction coefficient of the flow obstruction section, the molten iron flow rate is too fast, which can easily lead to sand erosion defects.

[0007] While the existing method of directly connecting the upper and lower risers with vertical runners allows for rapid casting, the large modulus of the vertical runners makes it difficult to separate the molten iron between the upper and lower risers. This results in the upper riser feeding the lower riser while simultaneously feeding the casting, and the continuous supply of molten iron to the lower riser prevents the shell above the riser from breaking through, leading to defects such as porosity caused by the backflow of molten iron into the casting.

[0008] A search of existing patent CN 202639227 U reveals a casting system for automotive brake caliper housings on a vertical parting line, but this patent does not explicitly disclose a technical solution to the aforementioned technical problem.

[0009] Therefore, in order to improve or solve at least one of the above-mentioned technical problems, it is necessary to improve the existing gating system. Summary of the Invention

[0010] The purpose of this invention is to provide a riser unit that facilitates the breaking of the shell in the lower riser.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A riser unit includes riser components, each of which includes a riser, and the riser is provided with an inlet, an outlet, and a riser neck. Each riser has an inlet connected to an upper gating system; and an outlet connected to a lower gating system. Adjacent riser components can be connected to each other, with the lower gating system on one riser connected to the upper gating system of the adjacent riser; the lower gating system overlaps with the adjacent upper gating system.

[0012] The upper gating system includes an upper flat gating system and an upper lower gating system; the length of the horizontal projection of the upper flat gating system is greater than the length of the horizontal projection of the upper lower gating system; the width of the horizontal projection of the upper flat gating system is less than the width of the horizontal projection of the upper lower gating system.

[0013] A gating system includes a gating unit and a runner unit; the gating unit is connected to the runner unit. The gating unit includes a gating cup; the runner unit includes at least one sprue; and each sprue is connected to at least one riser unit as described above.

[0014] The gating unit includes a slow-flow horizontal gating; the pouring cup is connected to the straight gating via the slow-flow horizontal gating.

[0015] The slow-flow horizontal runner includes a central runner; each of the two ends of the central runner is provided with an end runner; the horizontal cross-sectional area of ​​the central runner is larger than that of the end runners.

[0016] The end gating is connected to the middle gating via a connecting gating; the end gating and the middle gating are staggered; there is a height difference between the end gating and the middle gating; the connecting gating is inclined.

[0017] The slow-flow horizontal gating is connected to the straight gating via a connecting unit; the connecting unit includes a cut-off gating and a short horizontal gating; one end of the cut-off gating overlaps the slow-flow horizontal gating; the other end is connected to the adjacent straight gating via the short horizontal gating.

[0018] The short horizontal runner is connected to the adjacent vertical runner via a flat runner.

[0019] The pouring cup is stepped; the pouring cup includes an upper pouring runner and a lower pouring runner; the upper pouring runner is connected to the slow-flow cross runner through the lower pouring runner; both the upper and lower pouring runners are inverted frustum cones; the minimum inner diameter of the upper pouring runner is not less than the maximum inner diameter of the lower pouring runner. The gating unit includes three sprues; the three sprues are arranged in parallel at intervals; each sprue has multiple risers; each riser has at least one riser neck; adjacent sprues have the same number of risers; the riser in the middle sprue has two riser necks; the risers in the sprues on both sides have one riser neck.

[0020] The advantages of this invention are: This invention discloses a riser unit and a gating system having the riser unit.

[0021] The riser unit disclosed in this invention facilitates the connection between adjacent risers by setting up a lower connecting gating system and an upper connecting gating system, while requiring the lower connecting gating system and the adjacent upper connecting gating system to overlap. This setting can slow down the flow rate of molten metal between adjacent risers. At the same time, through the above connection method, this invention can reduce the connection modulus between the upper and lower risers while ensuring the same flow resistance area, so that the molten iron between the two risers can be disconnected as early as possible during the cooling process without interfering with each other; thus facilitating the breaking of the shell of the lower riser.

[0022] In addition, the present invention, through the combined use of stepped pouring cups, slow-flow horizontal runners, intercepting runners, short horizontal runners and flat runners, can form multi-stage impurity removal, and can also effectively reduce the kinetic energy of molten metal impacting the cavity wall, reduce derivative defects such as sand holes and porosity, reduce the amount of casting cleaning work, and improve production efficiency.

[0023] By setting up a flow interception channel, this invention can slow down the molten iron with a relatively fast flow rate in the slow-flowing horizontal pouring channel, reduce the scouring and erosion effect on the channel, and limit the inflow of molten metal, so that the slow-flowing horizontal pouring channel can be filled quickly. Sand and slag impurities that enter the slow-flowing horizontal pouring channel with the molten metal can float above the molten metal and be captured by the sand and slag absorption surface. Attached Figure Description

[0024] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings: Figure 1 This is a structural schematic diagram from a first perspective when adjacent risers overlap according to the present invention.

[0025] Figure 2 This is a structural schematic diagram from a second perspective when adjacent risers overlap according to the present invention.

[0026] Figure 3 This is a schematic diagram of the casting system in this invention.

[0027] The markings in the above figures are all: 1. Pour cup, 2. Slow-flow runner, 3. Cut-off runner, 4. Short runner, 5. Flat runner, 6. Straight runner, 7. Riser, 8. Lower runner, 9. Upper runner, 10. Casting cavity. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0029] The gating system disclosed in this invention mainly includes a gating unit, a sprue unit, and a riser unit connected thereto. The molten metal flows sequentially through the gating unit and the sprue unit, and finally enters and fills the casting cavity 10 through the riser unit.

[0030] The gating unit adopts a stepped gating cup 1 structure. This gating cup 1 consists of an upper gating channel 11 and a lower gating channel 12 connected from top to bottom. Both the upper gating channel 11 and the lower gating channel 12 are inverted frustum-shaped, and the minimum inner diameter of the upper gating channel 11 is not less than the maximum inner diameter of the lower gating channel 12, forming a stepped transition. This stepped inverted frustum-shaped structure can provide multi-stage buffering and deceleration for the initially injected molten metal, effectively reducing the falling kinetic energy and impact force of the molten metal, initially reducing air entrapment and splashing, and laying the foundation for subsequent smooth filling.

[0031] The gating unit includes a slow-flow horizontal gating 2 and multiple vertical gating 6.

[0032] The slow-flow horizontal gating 2 is used to receive molten metal from the lower gating 12 of the pouring cup 1. Its structural feature is that it includes a central gating 21 located in the middle, and end gating 23 connected to both ends of the central gating 21.

[0033] The horizontal cross-sectional area of ​​the middle gating 21 is designed to be larger than that of the end gating 23. The end gating 23 and the middle gating 21 are not directly connected, but are spatially staggered and have a certain height difference. The two are connected by an inclined connecting gating 22.

[0034] The enlarged cross-section of the central gating 21 forms a "diffuser chamber," which significantly reduces the flow rate of the molten metal, facilitating the flotation of impurities. The staggered and height-differential intermediate gating 22 further consumes the flow energy of the molten metal, changes its flow direction, and promotes the separation of inclusions.

[0035] The gating unit also includes three parallel sprues 6 spaced apart.

[0036] The top of each straight runner 6 is connected to the end runner 23 of the slow-flow horizontal runner 2 via a connecting unit.

[0037] The connecting unit includes a truncated gating 3 and a short cross gating 4. One end of the truncated gating 3 directly overlaps the end gating 23 of the slow-flow cross gating 2, and the other end is connected to the top of the corresponding sprue 6 via the short cross gating 4. Furthermore, the short cross gating 4 is connected to the upper inlet of the sprue 6 via a flat gating 5.

[0038] The throttling gating 3 acts as a flow-regulating component, limiting and stabilizing the flow rate of molten metal from the slow-flowing horizontal gating 2 into each vertical gating 6, ensuring uniform distribution within the system. The combination of the short horizontal gating 4 and the flat gating 5 creates localized resistance and flow direction changes at the connection point, which helps to capture any small amounts of fine impurities that may flow out of the slow-flowing horizontal gating 2, achieving secondary filtration.

[0039] In this invention, the riser unit is composed of multiple riser components that can be interconnected.

[0040] Each riser component includes a riser 7, which has an inlet, an outlet, and a riser neck 71 for feeding the casting cavity 10.

[0041] Each riser 7 has an inlet connected to an upper gating system 9. This upper gating system 9 is primarily used to connect the riser 7 to the lower gating system 8 at the bottom of its upper counterpart. The upper gating system 9 includes an upper lower gating system 92 near the riser 7 and an upper flat gating system 91 connected thereto. The projected length of the upper flat gating system 91 on the horizontal plane is greater than the projected length of the upper lower gating system 92, while its projected width is smaller than the projected width of the upper lower gating system 92.

[0042] Each riser 7 has a liquid outlet connected to a lower gating 8. Adjacent riser components can be connected end to end. Specifically, the end of the lower gating 8 of the upper riser component directly overlaps the upper flat gating 91 of the upper gating 9 of the adjacent lower riser component.

[0043] The flat, elongated design of the upper gating 91 forms a specific overlapping relationship with the end of the lower gating 8, creating an "overlapping bridge" structure. This structure effectively slows down the flow rate of molten metal from one riser 7 to another. More importantly, while ensuring the necessary flow cross-sectional area of ​​the system, it significantly reduces the modulus (solidification modulus) of the connecting channel between the upper and lower risers 7, allowing the molten metal in this connecting channel to cool rapidly and solidify. In this way, the series-connected upper and lower risers 7 are isolated from each other in the later stages of solidification, without interfering with each other. The lower riser 7 can be safely and easily removed without affecting the feeding effect of the upper riser 7, and the cleaning process is also simplified.

[0044] In this invention, multiple riser units are connected to each of the three parallel sprues 6, forming a multi-stage series of risers 7. To accommodate the need for symmetrical filling, each riser 7 on the sprue 6 located in the middle position has two riser necks 71 to simultaneously feed the casting to both sides; while each riser 7 on the sprues 6 located on both sides has one riser neck 71, which mainly feeds the casting to the outside or one side.

[0045] The same number of risers 7 are arranged on all sprue 6, ensuring the balanced distribution of molten metal flow.

[0046] The casting system disclosed in this invention achieves primary buffering through a stepped pouring cup 1, performs primary impurity removal and flow stabilization through a slow-flowing horizontal runner 2 with pressure diffusion and direction changing functions, distributes flow and performs secondary filtration through a connecting unit containing flow interception and flat structure, and finally uses a riser unit with a special overlapping structure to gradually reduce speed and automatically disconnect after solidification.

[0047] The entire system works in synergy to minimize the impact energy of molten metal flow, effectively remove slag impurities, reduce the risk of defects such as sand holes and porosity in castings, and optimize the feeding efficiency and cleaning convenience of riser 7, significantly improving the production quality and efficiency of large and complex castings.

[0048] The riser unit disclosed in this invention is essentially the liquid outlet unit of a gating system. Each Mocha unit generally includes at least two riser components. In this invention, three riser components are used. Each riser component includes a riser 7, which has an inlet, an outlet, and a riser neck 71. The inlet of each riser 7 is connected to an upper gating 9. The outlet of each riser 7 is connected to a lower gating 8. Adjacent riser components can be connected to each other. The lower gating 8 on one riser 7 is connected to the upper gating 9 of the adjacent riser 7. The lower gating 8 and the adjacent upper gating 9 overlap. In this invention, the upper gating 9 serves as the channel for molten metal to enter the riser 7. Its unique structure (such as the flattened part) can provide initial buffering and deceleration for the molten metal at the inlet and provide an interface for overlapping with the lower gating 8.

[0049] The lower gating 8 serves as the channel through which molten metal flows out of the current riser 7 and toward the next riser 7; its end structure forms a specific overlapping relationship with the adjacent upper gating 9, and is a key part for controlling the flow rate of molten metal between the two risers 7 and the solidification characteristics of the connecting channel.

[0050] The lower gating 8 of the upper riser 7 directly overlaps the upper gating 9 of the lower riser 7, forming a non-straight-through connection with a changing contact interface. This design of connecting adjacent risers 7 by overlapping mainly produces the following core effects: Changes in flow pattern and deceleration: The overlapping structure changes the direct flow direction of the molten metal, creating local resistance at the joint, which effectively reduces the speed at which the molten metal flows from one riser 7 to the next riser 7, and reduces the impact on the cavity 10.

[0051] Controlling the modulus and preventing early solidification disconnection (the most critical effect): While ensuring the necessary flow cross-sectional area (resistance area), this overlapping design effectively reduces the solidification modulus (i.e., the ratio of volume to heat dissipation surface area) of the connecting channel between the upper and lower risers 7. The smaller the modulus, the faster the cooling and solidification. This allows the molten metal in the connecting channel to solidify and disconnect earlier, while the main body of riser 7 is still in a liquid state for feeding.

[0052] Achieving independent operation of riser 7: After the connecting channel is disconnected early, the individual risers 7 connected in series are isolated from each other during the most critical solidification and feeding stage, without interfering with each other. Each riser 7 can independently and effectively feed the area of ​​the casting it is responsible for, avoiding the problem of low feeding efficiency of the lower riser 7 or local shrinkage porosity of the casting caused by the "string of candied haws" effect.

[0053] The riser unit of this invention uses a unique "overlapping" connection design. Its core purpose is to ensure the smooth filling of molten metal while achieving early solidification isolation of the connection channels between risers 7, thereby ensuring independent and effective feeding of each riser 7.

[0054] In this invention, the upper gating system 9 includes an upper flat gating system 91 and an upper lower gating system 92. The length of the horizontal projection of the upper flat gating system 91 is greater than the length of the horizontal projection of the upper lower gating system 92. The width of the horizontal projection of the upper flat gating system 91 is less than the width of the horizontal projection of the upper lower gating system 92. The upper gating system 9 of this invention is not a straight cylinder with a uniform cross-section, but mainly includes the upper lower gating system 92 and the upper flat gating system 91. The section of the upper lower gating system 92 near the riser 7 has a relatively short and wide horizontal projection (i.e., top view shape). The section of the upper flat gating system 91 connected to the end of the lower gating system and used to overlap with the upper lower gating system 8 has a long and narrow horizontal projection.

[0055] The riser component of this invention adopts the above design. When the molten metal flows in, the narrow and long flat section has a slight throttling and constraint effect on the liquid flow, which helps to stabilize the flow rate and smooth the flow state. It also increases the floating of light inclusions (such as slag particles) in the molten metal, and plays an auxiliary role in slag blocking.

[0056] The long and narrow shape means that, for the same cross-sectional area (to ensure flow rate), the flat gating system has a larger heat dissipation surface area; this directly leads to a significant reduction in its solidification modulus (volume / surface area), making the molten metal at the overlapping part cool and solidify much faster than the body of riser 7 and other parts; this is precisely how adjacent risers 7 achieve early solidification separation during the feeding stage.

[0057] A gating system includes a gating unit and a gating system; the gating unit is connected to the gating system; the gating unit includes a gating cup 1; the gating system includes at least one sprue 6; each sprue 6 is connected to at least one riser unit; the gating unit, as the "inlet" and "primary processor" of the gating system, is mainly responsible for receiving molten metal from the ladle and performing initial buffering, flow stabilization and preliminary slag blocking.

[0058] The gating unit is responsible for guiding the molten metal horizontally to different vertical heights or areas of the mold.

[0059] The riser unit connected to each sprue 6 serves as the terminal feeding and conveying module of the system. It is responsible for receiving the molten metal from the sprue 6 and working in its unique overlapping series connection mode to ultimately achieve stable filling and sequential feeding of the casting cavity 10.

[0060] In this invention, the sprue 6 and the riser unit are essentially an integral structure; the riser component in the riser unit is equivalent to being connected in series with the sprue 6.

[0061] In this invention, the gating unit includes a slow-flow horizontal gating 2; the pouring cup 1 is connected to the straight gating 6 through the slow-flow horizontal gating 2; the slow-flow horizontal gating 2 disclosed in this invention mainly serves to slow down the flow, reduce speed, and remove impurities.

[0062] In this invention, the slow-flow horizontal runner 2 includes a central runner 21; each of the two ends of the central runner 21 is provided with an end runner 23; the horizontal cross-sectional area of ​​the central runner 21 is larger than that of the end runners 23; the central runner 21 is connected below the pouring cup 1, and the end runners 23 provide good lateral connection and communication; the lateral dimension of the central runner 21 is larger, and the lateral dimension of the end runners 23 is smaller. The small, low-speed, and stable environment of the central gating 21 greatly reduces the entrainment of impurities by turbulence. The larger central cross-section acts like an "energy storage tank" or "voltage stabilizer," absorbing instantaneous flow fluctuations from the pouring cup 1, making the flow of molten metal to the two intercepting gating 3 more uniform and stable. The slow-flowing transverse gating 2, with a large central cross-section and small cross-sections at both ends, actively creates a low-speed settling zone, effectively solving the problem of removing heavy inclusions while taking into account both flow stability and uniform distribution.

[0063] In this invention, the end gating 23 is connected to the middle gating 21 via the connecting gating 22; the end gating 23 and the middle gating 21 are staggered; there is a height difference between the end gating 23 and the middle gating 21; the connecting gating 22 is inclined; the molten metal can only enter the high end gating 23 from the low middle gating 21 by passing through the inclined, direction-changing connecting gating 22; this can consume a certain amount of kinetic energy; at the same time, the forced change of the liquid flow direction can reduce the speed and also help remove impurities.

[0064] In this invention, the slow-flow horizontal gating 2 is connected to the straight gating 6 via a connecting unit. The connecting unit includes a cut-off gating 3 and a short horizontal gating 4. One end of the cut-off gating 3 overlaps the slow-flow horizontal gating 2, and the other end is connected to the adjacent straight gating 6 via the short horizontal gating 4. The connection unit facilitates the connection and communication between the slow-flow horizontal gating 2 and the straight gating 6. In this invention, the cut-off gating 3 mainly plays a good role in connecting and slowing down the flow. It facilitates the transfer of molten metal between the slow-flow horizontal gating 2 and the short horizontal gating 4. At the same time, because the cut-off gating 3 has a high coefficient of friction, it can slow down the molten metal with a relatively fast flow rate in the slow-flow horizontal gating 2, reduce the scouring and erosion effect on the flow channel, and allow the slow-flow horizontal gating 2 to fill quickly. Sand and slag impurities that enter the slow-flow horizontal gating 2 with the molten metal can float above the molten metal and be captured by the sand and slag absorption surface.

[0065] In this invention, the intercepting gating 3 overlaps with the slow-flowing horizontal gating 2. By adopting the overlapping method, a C-shaped structure can be formed at the connection between the slow-flowing horizontal gating 2, the intercepting gating 3 and the short horizontal gating 4, resulting in at least two flow corners, which facilitates the autonomous impurity removal operation of the molten metal.

[0066] In this invention, the central gating 21 of the slow-flowing horizontal gating 2, with its larger cross-section, can smoothly and with low impact receive the mainstream molten metal from the pouring cup 1, avoiding severe turbulence in the flow. Subsequently, the molten metal is diverted to the two end gating 23; this "coarse in the middle and fine at the edges" design helps to establish a relatively balanced pressure gradient within the horizontal gating system, guiding the molten metal to flow orderly to each outlet (intercepting gating 3).

[0067] By using an overlapping connection instead of a direct-flow connection, the molten metal passes through two corners; this process causes some of the lighter slag to float to the surface and be blocked in the slow-flowing horizontal gating channel 2, thus achieving slag removal while throttling.

[0068] By throttling, the potentially unstable liquid flow is transformed into a more stable and controllable stream, creating optimal inlet conditions for downstream slow flow and purification.

[0069] Creating conditions for impurities to float: Low flow rate and a relatively calm environment provide ample time and space for impurities such as sand and slag that flow in with the molten metal to float.

[0070] Forming an efficient slag-catching zone: Its top is designed with a sand and slag absorption surface (such as a refractory filter or a special shape), which can effectively capture and retain impurities that float to the top.

[0071] In this invention, the short horizontal runner 4 is connected to the adjacent straight runner 6 via a flat runner 5; the design of the flat runner 5 plays a good role in connection and communication, facilitating the connection between the short horizontal runner 4 and the straight runner 6.

[0072] The flat runner 5 increases the contact area between the inner wall and the liquid flow, resulting in a higher coefficient of friction and thus further reducing the speed of the molten metal.

[0073] In this invention, the pouring cup 1 is stepped; the pouring cup 1 includes an upper gating channel 11 and a lower gating channel 12; the upper gating channel 11 is connected to the slow-flow transverse gating 2 through the lower gating channel 12; both the upper gating channel 11 and the lower gating channel 12 are inverted frustum cones; the minimum inner diameter of the upper gating channel 11 is not less than the maximum inner diameter of the lower gating channel 12; the stepped design of the pouring cup 1 in this invention means that a stepped platform is formed inside the pouring cup 1, and when the molten metal falls from the ladle, it first impacts the bottom of the upper gating channel 11 (i.e., the shoulder of the stepped platform); the minimum inner diameter (bottom outlet) of the upper gating channel 11 is ≥ The maximum inner diameter of the lower gating 12 (top inlet); when the molten metal flows and hits the shoulder of the step, its vertical downward kinetic energy is suddenly interrupted and transformed into violent turbulence, achieving the first stage of forced deceleration; thus, before the molten metal enters the sprue 6, its impact speed and kinetic energy have been greatly weakened, reducing the pressure of the entire system on high-speed flow processing from the source.

[0074] Physical barrier of the steps: The step shoulder itself is a perfect slag-blocking dam. Most of the molten slag that rises to the surface of the upper cup gating channel 11 is blocked by this "dam" in the upper cup and cannot enter the lower cup.

[0075] Inverted truncated cone shape: guides the molten metal flow towards the center, helps maintain a concentric flow, and reduces impact and splashing on the cup wall.

[0076] The gating unit in this invention includes three sprues 6; the three sprues 6 are arranged in parallel at intervals; each sprue 6 is provided with a plurality of risers 7; each riser 7 is provided with at least one riser neck 71; adjacent sprues 6 have the same number of risers 7; wherein the riser 7 arranged on the middle sprue 6 is provided with two riser necks 71. The risers 7 on the sprues 6 arranged on both sides are provided with riser necks 71. The three sprues 6 of this invention are used in combination. Generally, three risers 7 are connected in series on the middle sprue 6. Each riser 7 on the middle sprue 6 is provided with a riser neck 71 on both sides. The sprues 6 at the two edges are also provided with three risers 7. The risers 7 on the middle sprue 6 and the risers 7 on the edge sprues 6 are arranged opposite to each other. Six casting cavities 10 are arranged in the interval area between the three sprues 6. In subsequent use, each casting cavity 10 is connected to the riser 7 on the middle sprue 6 on one side and the riser 7 on the edge sprue 6 on the other side, so as to realize the liquid inlet operation on both sides of the casting cavity 10.

[0077] The risers 7 on adjacent sprues 6 are arranged opposite each other: the riser necks 71 connected to the two adjacent sprues 6 face each other or are positioned opposite each other; when the molten metal flows from the risers 7 on the two adjacent sprues 6 into the same casting cavity 10, the liquid flow meets and merges in the middle region of the cavity 10; this design can effectively guide the molten metal flow to fill in opposite directions, promote the smooth connection of the liquid flow front, and avoid the formation of flow dead corners or cold shut lines in the middle of the cavity 10.

[0078] Obviously, the specific implementation of this invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A feeder unit, characterized by The sprue component comprises a sprue, and the sprue is provided with a liquid inlet, a liquid outlet and a sprue neck; The liquid inlet of each sprue is connected with an upper gate; and the liquid outlet of each sprue is connected with a lower gate; The adjacent sprue components can be connected with each other, and the lower gate of one sprue is connected with the upper gate of the adjacent sprue; and the lower gate and the upper gate are overlapped with each other.

2. A feeder unit according to claim 1, characterised in that The upper gate comprises an upper flat gate and an upper lower gate; the length of the horizontal projection of the upper flat gate is greater than that of the upper lower gate; and the width of the horizontal projection of the upper flat gate is smaller than that of the upper lower gate.

3. A gating system characterized in that, The sprue unit and the gate unit are connected with each other. The sprue unit comprises a sprue cup; and the gate unit comprises at least one straight gate; and each straight gate is connected with at least one sprue component as claimed in any one of claims 1-2.

4. A gating system according to claim 3, wherein The gate unit comprises a slow-flow cross gate; and the sprue cup is connected with the straight gate through the slow-flow cross gate.

5. A gating system according to claim 4, wherein The slow-flow cross gate comprises a middle gate; and each end of the middle gate is provided with an end gate; and the horizontal cross-sectional area of the middle gate is greater than that of the end gate.

6. A gating system according to claim 5, wherein The end gate is connected with the middle gate through a middle connecting gate; the end gate and the middle gate are distributed in a staggered manner; there is a height difference between the end gate and the middle gate; and the middle connecting gate is arranged in an inclined manner.

7. A gating system according to claim 6, characterised in that The slow-flow cross gate is connected with the straight gate through a connecting unit; the connecting unit comprises a cut-off gate and a short cross gate; one end of the cut-off gate is overlapped on the slow-flow cross gate; and the other end is connected with the adjacent straight gate through the short cross gate.

8. A gating system according to claim 4, wherein The short cross gate is connected with the adjacent straight gate through a flat gate.

9. A gating system according to claim 3, wherein The sprue cup comprises a stepped structure; the sprue cup comprises an upper cup gate and a lower cup gate; the upper cup gate is connected with the slow-flow cross gate through the lower cup gate; the upper cup gate and the lower cup gate are both in the shape of an inverted truncated cone; and the minimum inner diameter of the upper cup gate is not smaller than the maximum inner diameter of the lower cup gate.

10. A gating system according to claim 3, wherein The gate unit comprises three straight gates; the three straight gates are distributed in a parallel and spaced manner; each straight gate is provided with a plurality of sprues; each sprue is provided with at least one sprue neck; the number of sprues arranged on the adjacent straight gates is the same; the sprues arranged on the middle straight gate are provided with two sprue necks; and the sprues arranged on the straight gates on both sides are provided with one sprue neck.

Images